Thanks for great advice. I first tried with the cable from a portable dvd player with my 30gb 5th gen and my daughters 3rd gen nano. neither worked with this cable and i found another cable from our camcorder this one worked at treat (reversing the colours)with my 30gb no joy with my daughters nano though - much as I had expected. Overjoyed as will be watching some videos downloaded from itunes on the car player via my ipod during a long journey from Calgary to Vancouver! Many many thanks!